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Consider the following pie shaped circuit. The arm is free to pivot about the center, P, and has mass m and resistance R. (a) If the angle e increases in time (the bar is rising), what is the direction of current? (Consider what the Lenz law says.) (b) See that the area of the pie is given by A = na (). If e = e(t), what is the rate of change of magnetic flux through the pie-shaped circuit, and hence, determine the emf 5 produced in the circuit? (c) What is the current / in the circuit? (d) What is the magnetic force on the bar (magnitude and direction - indicated on figure). (e) What torque does this create about P? (HINT: Assume force acts at bar center) Best P a

Consider the following pie shaped circuit. The arm is free to pivot about the center, P, and has mass m and resistance R. (a) If the angle e increases in time (the bar is rising), what is the direction of current? (Consider what the Lenz law says.) (b) See that the area of the pie is given by A = na (). If e = e(t), what is the rate of change of magnetic flux through the pie-shaped circuit, and hence, determine the emf 5 produced in the circuit? (c) What is the current / in the circuit? (d) What is the magnetic force on the bar (magnitude and direction - indicated on figure). (e) What torque does this create about P? (HINT: Assume force acts at bar center) Best P a

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Consider the following pie shaped circuit. The arm is free to pivot about the center, P, and has mass m and resistance R. (a) If the angle e increases in time (the bar is rising), what is the direction of current? (Consider what the Lenz law says.) (b) See that the area of the pie is given by A = ra° (. If e = e(t), what is the rate of change of magnetic flux through the pie-shaped circuit, and hence, determine the emf 5 produced in the circuit? (c) What is the current / in the circuit? (d) What is the magnetic force on the bar (magnitude and direction - indicated on figure). (e) What torque does this create about P? (HINT: Assume force acts at bar center) Bet P a
Transcribed Image Text:Consider the following pie shaped circuit. The arm is free to pivot about the center, P, and has mass m and resistance R. (a) If the angle e increases in time (the bar is rising), what is the direction of current? (Consider what the Lenz law says.) (b) See that the area of the pie is given by A = ra° (. If e = e(t), what is the rate of change of magnetic flux through the pie-shaped circuit, and hence, determine the emf 5 produced in the circuit? (c) What is the current / in the circuit? (d) What is the magnetic force on the bar (magnitude and direction - indicated on figure). (e) What torque does this create about P? (HINT: Assume force acts at bar center) Bet P a
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